Towards Autonomic Service Provisioning Systems

This paper discusses our experience in building SPIRE, an autonomic system for service provision. The architecture consists of a set of hosted Web Services subject to QoS constraints, and a certain number of servers used to run session-based traffic. Customers pay for having their jobs run, but require in turn certain quality guarantees: there are different SLAs specifying charges for running jobs and penalties for failing to meet promised performance metrics. The system is driven by an utility function, aiming at optimizing the average earned revenue per unit time. Demand and performance statistics are collected, while traffic parameters are estimated in order to make dynamic decisions concerning server allocation and admission control. Different utility functions are introduced and a number of experiments aiming at testing their performance are discussed. Results show that revenues can be dramatically improved by imposing suitable conditions for accepting incoming traffic; the proposed system performs well under different traffic settings, and it successfully adapts to changes in the operating environment.Comment: 11 pages, 9 Figures, http://www.wipo.int/pctdb/en/wo.jsp?WO=201002636

The strategic evolution of Aer Lingus from a full-service airline to a low-cost carrier and finally positioning itself into a value hybrid airline

Aer Lingus has been an unique airline as it transitioned from a full-service airline to a low-cost carrier and is currently positioned as a value hybrid airline. It has coexisted with Ryanair for decades and it encountered three imminent periods where bankruptcy prevailed from 1993 to 2009. The research aims to uncover the various strategies that were applied to structurally re-engineer the carrier in order to adapt to its evolving competitive landscape. The key pillars underpinning Aer Lingus’ turnaround as a value hybrid were as follows: strict adherence to capacity discipline; relentless cost control and value-adding, consumer-driven product differentiation; innovative partnerships including contract flying to alleviate its problematic seasonality issues inherent in Aer Lingus markets; and by re-engineering its Dublin-based hub airport. A visionary master plan for the hub was fabricated to capitalize on Ireland’s geographical positioning which targeted the traffic flows between UK/European and North American destinations through its synchronized connection network at Dublin

Middleware for managing a large, heterogeneous programmable network

The links between BTexact Technologies and the Department of Computing Science at University College London are becomingincreasingly beneficial for the development of the middleware area for the management of programmable networks. This paperdescribes the work that has been done to date, and outlines the plans for future research

Corruption and firm behavior

This paper investigates how corruption affects firrm behavior. Firms can engage in two types of corruption when seeking a public service: cost-reducing "collusive" corruption and cost increasing "coercive" corruption. Using an original and unusually rich dataset on bribe payments at ports matched to firrm-level data, we observe how firms respond to each type of corruption by adjusting their shipping and sourcing strategies. "Collusive" corruption is associated with higher usage of the corrupt port, while "coercive" corruption is associated with reduced demand for port services. Our results suggest that firms respond to the opportunities and challenges created by different types of corruption, organizing production in a way that increases or decreases demand for the public service. Understanding how firms respond to corruption has important implications for how we conceptualize, identify and measure the overall impact of corruption on economic activity

A novel multipath-transmission supported software defined wireless network architecture

The inflexible management and operation of today\u27s wireless access networks cannot meet the increasingly growing specific requirements, such as high mobility and throughput, service differentiation, and high-level programmability. In this paper, we put forward a novel multipath-transmission supported software-defined wireless network architecture (MP-SDWN), with the aim of achieving seamless handover, throughput enhancement, and flow-level wireless transmission control as well as programmable interfaces. In particular, this research addresses the following issues: 1) for high mobility and throughput, multi-connection virtual access point is proposed to enable multiple transmission paths simultaneously over a set of access points for users and 2) wireless flow transmission rules and programmable interfaces are implemented into mac80211 subsystem to enable service differentiation and flow-level wireless transmission control. Moreover, the efficiency and flexibility of MP-SDWN are demonstrated in the performance evaluations conducted on a 802.11 based-testbed, and the experimental results show that compared to regular WiFi, our proposed MP-SDWN architecture achieves seamless handover and multifold throughput improvement, and supports flow-level wireless transmission control for different applications

Railway Reform in China.

The purpose of this working paper is to consider the current situation of Chinese Railways, the progress of reforms to date, and possible future developments. The first section describes the current problems of Chinese Railways, as a vast organisation subject to strong central control, facing enormous and rapidly growing demands which it is unable to satisfy. The progress of reform in Chinese Railways to date, and in particular the Economic Contract Responsibility System instituted in the late 1980's and the development of joint venture companies to build new lines, are then described. In the following section the key reform models found in other countries - deregulation and privatisation of vertically integrated regional companies; separation of infrastructure from operations with open access andlor franchising competitors; or reorganisation on the basis of business sectors - are then described. None is fully suitable for China, but it is suggested that a combination of sectorisation, more commercial independence, further development of joint public/private partnerships and more contracting out, is the most likely way forward